"We have analysed security camera footage and we are intrigued to find out why the paper ignited as quickly as it did" he added.
Smith Anderson group chief executive Brian Henry said the mill was back in full production within 48 hours thanks to staff initiative.
Six appliances were called to the blaze at the mill in Leslie on 29 August, and stayed on site for 48 hours.
The fire took hold in four separate areas, two of which held around 500 tonnes each of bailed paper. A covered area held a further 500 tonnes, while a four-storey building used for paper storage developed a structural problem, which caused fire crews to be withdrawn.
Due to high winds in the area, the ignited paper was blown around the mill, causing separate blazes.
The mill has a capacity of 75,000 tonnes a year and manufactures, supplies and recycles paper, plastic, packaging and stationery.
Story by Andy Scott
